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A "virtual issue" is a new online publication option offered by the publishers of the System Dynamics Review (SDR) journal. A virtual issue consists of a collection of articles on a specific topic, which have previously been published in SDR, a topic-specific bibliography and a summary by the editors. These thematic issues will be available online. As the second of a series, the virtual issue that is edited by Jim Duggan and Rogelia Oliva is made online in February 2013, and it focuses on structural dominance analysis. The issue includes the following key articles on the topic;

"Loop polarity, loop dominance, and the concept of dominant polarity" by George P. Richardson

"Dominant structure" by George P. Richardson

"Reality check: A bridge between systems thinking and system dynamics" by David W. Peterson and Robert L. Eberlein